Speedometer gear color
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Speedometer gear color
Hello- I'm new on the forum-been lurking-and need some help. I'm putting an '86 F-150 3 sp+OD trans behind a '51 flathead. 4.11 gears in the rear, 15 x 2.15 tires. Went to the dealer for a gear to put on the trans end of the cable and they said I needed to know the gear color or # of teeth. Does anyone have a X-over chart for the 4.11 and the 3.55 ratios? Or have that combo apart and can check the color?
Thanks in advance.
RB35
Thanks in advance.
RB35
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Don't know the color, but the 4.11 should have 86% of the teeth that the 3.55 uses.
3.55 divided by 4.11 equals .8637
So, using an arbitrary number, say the speedo drive gear for the 3.55 has 20 teeth, the 4.11 would require 86% of twenty, or 17 teeth. (closest whole number.)
3.55 divided by 4.11 equals .8637
So, using an arbitrary number, say the speedo drive gear for the 3.55 has 20 teeth, the 4.11 would require 86% of twenty, or 17 teeth. (closest whole number.)
New User
Joined: Jan 2008
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Have a look here.
http://www.tciauto.com/tech_info/speedo_gears.htm
Ford is at the bottom of the page.
http://www.tciauto.com/tech_info/speedo_gears.htm
Ford is at the bottom of the page.
